GB1445139A - Process for producing hydrogen fluoride - Google Patents

Process for producing hydrogen fluoride

Info

Publication number
GB1445139A
GB1445139A GB4252373A GB4252373A GB1445139A GB 1445139 A GB1445139 A GB 1445139A GB 4252373 A GB4252373 A GB 4252373A GB 4252373 A GB4252373 A GB 4252373A GB 1445139 A GB1445139 A GB 1445139A
Authority
GB
United Kingdom
Prior art keywords
hydrogen fluoride
silicon dioxide
temperature
flame
flame hydrolysis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4252373A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB1445139A publication Critical patent/GB1445139A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C01B33/181—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by a dry process
    • C01B33/183—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by a dry process by oxidation or hydrolysis in the vapour phase of silicon compounds such as halides, trichlorosilane, monosilane
    • C01B33/184—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by a dry process by oxidation or hydrolysis in the vapour phase of silicon compounds such as halides, trichlorosilane, monosilane by hydrolysis of tetrafluoride
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B7/00—Halogens; Halogen acids
    • C01B7/19—Fluorine; Hydrogen fluoride
    • C01B7/191—Hydrogen fluoride
    • C01B7/193—Preparation from silicon tetrafluoride, fluosilicic acid or fluosilicates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B7/00—Halogens; Halogen acids
    • C01B7/19—Fluorine; Hydrogen fluoride
    • C01B7/191—Hydrogen fluoride
    • C01B7/195—Separation; Purification
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/50—Agglomerated particles
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Silicon Compounds (AREA)

Abstract

1445139 Hydrogen fluoride production; silica R S REED 10 Sept 1973 [18 Sept 1972] 42523/73 Heading C1A A process for the production of hydrogen fluoride comprises (a) forming a mixture of silicon tetrafluoride, water vapour and air; (b) flame hydrolysing the silicon tetrafluoride at a temperature of at least 1500‹ F. to produce silicon dioxide particles, the silicon dioxide having an averse primary particle size in excess of 0À1 microns, and hydrogen fluoride; (c) promoting agglomeration of the silicon dioxide particles by direct cooling of the reaction products and separating the silicon dioxide, the temperature of the reaction product gas stream being maintained at at least 900‹ F. during the cooling to agglomerate the silicon dioxide and the separation thereof; and (d) recovering the hydrogen fluoride. The reaction products of the flame hydrolysis are preferably cooled to between 500‹ and 800‹ F. below the flame temperature, e.g. to 1000-1500‹ F. The flame hydrolysis temperature is preferably in the range from 2000-3000‹ F. The ratio of the available water to the stoichiometric requirement of water for the flame hydrolysis reaction is preferably in the ratio from 2 : 1 to 15 : 1.
GB4252373A 1972-09-18 1973-09-10 Process for producing hydrogen fluoride Expired GB1445139A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US29012172A 1972-09-18 1972-09-18

Publications (1)

Publication Number Publication Date
GB1445139A true GB1445139A (en) 1976-08-04

Family

ID=23114613

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4252373A Expired GB1445139A (en) 1972-09-18 1973-09-10 Process for producing hydrogen fluoride

Country Status (5)

Country Link
BE (1) BE804531A (en)
CA (1) CA1022725A (en)
ES (1) ES418821A1 (en)
GB (1) GB1445139A (en)
NL (1) NL7312836A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206189A (en) 1977-01-04 1980-06-03 Belov Viktor Y Method of producing hydrogen fluoride and silicon dioxide from silicon tetra-fluoride

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103420383B (en) * 2013-07-29 2015-12-23 中国化学赛鼎宁波工程有限公司 Take phosphatic fertilizer by-product fluosilicate as the method that raw material prepares thermal silica and anhydrous hydrofluoric acid

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206189A (en) 1977-01-04 1980-06-03 Belov Viktor Y Method of producing hydrogen fluoride and silicon dioxide from silicon tetra-fluoride

Also Published As

Publication number Publication date
BE804531A (en) 1974-01-02
CA1022725A (en) 1977-12-20
ES418821A1 (en) 1976-12-01
NL7312836A (en) 1974-03-20

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee